Collisional relaxation of superthermal electrons generated by relativistic laser pulses in dense plasma.
Collisional relaxation of superthermal electrons generated by relativistic laser pulses in dense plasma.
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DOI：
10.1103/physrevlett.97.235001
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发表时间：
2006-11
影响因子：
8.6
通讯作者：
Andreas Kemp;Y. Sentoku;Vladimir Sotnikov;S. Wilks
中科院分区：
文献类型：
--
作者：
Andreas Kemp;Y. Sentoku;Vladimir Sotnikov;S. Wilks
在密度小于固体密度到1000倍固体密度范围内，分析了相对论激光脉冲在过密集等离子体中产生的热电子布居的能量驰豫。据预测，在较低密度下，主宰超热电子和等离子体之间能量传递的纵向束-等离子体不稳定性将被超过固体密度的碰撞所抑制。对于等离子体密度，确定了碰撞能量转移模式，即直接碰撞、扩散和阻性回流加热的各自作用。通过完全积分的一维碰撞粒子模拟，演示了碰撞过程中动态区和碰撞区之间的转换以及碰撞过程的标度。
Energy relaxation of the hot electron population generated by relativistic laser pulses in overdense plasma is analyzed for densities ranging from below to 1000 times solid density. It is predicted that longitudinal beam-plasma instabilities, which dominate energy transfer between hot electrons and plasma at lower densities, are suppressed by collisions beyond solid density. The respective roles of collisional energy transfer modes, i.e., direct collisions, diffusion, and resistive return current heating, are identified with respect to plasma density. The transition between the kinetic and the collisional regimes and scalings of collisional process are demonstrated by a fully integrated one-dimensional collisional particle simulation.